Crossword Genius

Toast last drink (7,2)

Ross

I believe the answer is:

bottoms up

'toast' is the definition.
(I've seen this before)

'last drink' is the wordplay.
'last' becomes 'bottom' (eg at the bottom of a list).
'drink' becomes 'sup' (to sup is to drink).
'bottom'+'sup'='BOTTOMS UP'

(Other definitions for bottoms up that I've seen before include "Your good health!" , "down it goes!" , "Toast" , "Down the hatch!" , "Cheers!" .)

I've seen this clue in The Times.
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